Curried Salmon Pasta Salad

8 ounces cooked, skinned salmon

1/2 cup minced red or yellow onion

1 cup diced celery

1 medium red apple, diced

1/2 cup chopped walnuts or dry-roasted, unsalted peanuts

Dressing:

1 (6 ounce) container fat-free yogurt

2 tablespoons olive oil

1 tablespoon curry powder

2 teaspoons fresh lemon juice

2 cloves garlic, crushed

1 teaspoon Dijon mustard

1/2 teaspoon salt (or to taste)

Freshly ground black pepper, to taste